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ASTRONOMY CHAPTER 6 ACTUAL
QUESTIONS 2026 WITH VERIFIED
ANSWERS.
What theory best explains solar system formation? - correct
answer-nebular theory: our solar system formed from a giant
cloud of gas
Galactic Recycling: - correct answer-elements that make
planets were made in stars and then recycled through
interstellar space... There is evidence from other gas clouds
Conservation of Angular Momentum: - correct answer-
something shrinking in size is going to rotate faster...
(remember the figure skater)
Flattening: - correct answer-collisions between particles in
cloud caused it to flatten into a disk
Conservation of Energy: - correct answer-gravity causes the
cloud to contract as the cloud heats up
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Frost line: - correct answer-Inside of the frost line is too hot for
hydrogen compounds to form ice. Outside of the frost line it is
cold enough for ices to form, but still have rock as well.
Formation of terrestrial planets - correct answer-Small particles
of rock/metal were present inside the frost line... planetesimals
of rock and metal built up.. They collided... Gravity caused the
planetesimals to build into terrestrial planets by the process of
accretion
Formation of Jovian planets - correct answer-Ice could also
form small particles outside the frost line... Jovian planets are
larger because they are made of rock and ice. Gravity pulls in
Hydrogen/Helium gas.
Asteroid and Comet formation: - correct answer-leftover from
accretion..
Rocky asteroids formed inside the frost line
Icy comets formed outside the frost line
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Heavy bombardment: - correct answer-leftover planetesimals
bombarded other objects in late stages of solar system
formation.. happened on Earth and moon
Origin of Earth's water... - correct answer-Water may have
come from icy planetesimals from outer solar system.
Giant impacts can explain exceptions. - correct answer-Uranus
tilted and large moon on Earth possibly because of giant
impacts?
Radioactive Decay: - correct answer-Some isotopes decay into
other nuclei
Potassium to Argon
Half-life: - correct answer-time for half the nuclei in a substance
to decay
Dating the solar system: - correct answer-Average 4.6 billion
years ago
ASTRONOMY CHAPTER 6 ACTUAL
QUESTIONS 2026 WITH VERIFIED
ANSWERS.
What theory best explains solar system formation? - correct
answer-nebular theory: our solar system formed from a giant
cloud of gas
Galactic Recycling: - correct answer-elements that make
planets were made in stars and then recycled through
interstellar space... There is evidence from other gas clouds
Conservation of Angular Momentum: - correct answer-
something shrinking in size is going to rotate faster...
(remember the figure skater)
Flattening: - correct answer-collisions between particles in
cloud caused it to flatten into a disk
Conservation of Energy: - correct answer-gravity causes the
cloud to contract as the cloud heats up
, Page | 2
Frost line: - correct answer-Inside of the frost line is too hot for
hydrogen compounds to form ice. Outside of the frost line it is
cold enough for ices to form, but still have rock as well.
Formation of terrestrial planets - correct answer-Small particles
of rock/metal were present inside the frost line... planetesimals
of rock and metal built up.. They collided... Gravity caused the
planetesimals to build into terrestrial planets by the process of
accretion
Formation of Jovian planets - correct answer-Ice could also
form small particles outside the frost line... Jovian planets are
larger because they are made of rock and ice. Gravity pulls in
Hydrogen/Helium gas.
Asteroid and Comet formation: - correct answer-leftover from
accretion..
Rocky asteroids formed inside the frost line
Icy comets formed outside the frost line
, Page | 3
Heavy bombardment: - correct answer-leftover planetesimals
bombarded other objects in late stages of solar system
formation.. happened on Earth and moon
Origin of Earth's water... - correct answer-Water may have
come from icy planetesimals from outer solar system.
Giant impacts can explain exceptions. - correct answer-Uranus
tilted and large moon on Earth possibly because of giant
impacts?
Radioactive Decay: - correct answer-Some isotopes decay into
other nuclei
Potassium to Argon
Half-life: - correct answer-time for half the nuclei in a substance
to decay
Dating the solar system: - correct answer-Average 4.6 billion
years ago
